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Firm Transportation Obligation (Tables)
 3 Months Ended
Mar. 31, 2016
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Related Obligations
The following table reconciles the obligation as of the dates presented:
 
As of
 
March 31,
 
December 31,
 
2016
 
2015
Balance at beginning of period
$
13,461

 
$
14,790

Accretion
175

 
942

Cash payments, net
(527
)
 
(2,271
)
Balance at end of period
$
13,109

 
$
13,461